US3926869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hardening gelatin in photographic layers which contain a thickener and hardener by utilizing acrylic acid-acrylamide copolymers
Assignee: Fujifilm Holdings Corp
•
Filing: 1974-06-07
•
Granted: 1975-12-16
•
Expires: 1994-06-07
Abstract
Abstract A process for hardening gelatin which comprises incorporating an acrylic acid-acrylamide copolymer into a system containing gelatin, a thickener and a hardener. Hardened gelatin layers having sufficiently high melting temperatures and high swelling can be obtained, which are useful as photographic layers.
Inventors
- 👤 Ikutaro Horie
- 👤 Taksuhi Miyazako
- 👤 Takeo Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A PROCESS FOR HARDENING GELATIN WHICH COMPRISES INCORPORATING AN ACRYLIC ACID-ACRYLAMIDE COPOLYMER INTO THE SYSTEM CONTAINING GELATIN, A THICKENER AND A HARDENER; SAID ACRYLIC ACID-ACRYLAMIDE COPOLYMER BEING A COPOLYMER CONTAINING ABOUT 5 TO 95 MOL % OF THE FOLLOWING REPEATING UNIT (A):
Claim 2
Dependent Claim
42 words
A PROCESS FOR HARDENING GELATIN WHICH COMPRISES INCORPORATING AN ACRYLIC ACID-ACRYLAMIDE COPOLYMER INTO THE SYSTEM CONTAINING GELATIN, A THICKENER AND A HARDENER; SAID ACRYLIC ACID-ACRYLAMIDE COPOLYMER BEING A COPOLYMER CONTAINING ABOUT 5 TO 95 MOL % OF THE FOLLOWING REPEATING UNIT (A):
Claim 3
Dependent Claim
30 words
The process for hardening gelatin of claim 1, wherein said alkyl group of said acrylic acid-acrylamide copolymer is a substituted alkyl group containing oxo, hydroxy or alkoxy groups as substituents.
Claim 4
Dependent Claim
33 words
The process for hardening gelatin of claim 2, wherein said copolymer contains said repeating unit (A) at 30 to 80 mol % and said repeating unit (B) at 20 to 70 mol %.
Claim 5
Dependent Claim
33 words
The process for hardening gelatin of claim 1, wherein said copolymer includes in addition up to 5 mol % of repeating units of a monomer copolymerizable with said repeating units (A) and (B).
Claim 6
Dependent Claim
46 words
The process for hardening gelatin of claim 1, wherein said hardener is an aldehyde compound, an active vinyl compound, an active halogen containing compound, an epoxy compound, an ethyleneimine compound, a methane sulfonic acid ester compound, a carbodiimide compound, an isoxazole compound, or an inorganic hardener.
Claim 7
Dependent Claim
20 words
The process for hardening gelatin of claim 1, wherein said thickener is the sodium or potassium salt of poly-p-vinylbenzenesulfonic acid.
Claim 8
Dependent Claim
31 words
The process for hardening gelatin of claim 1, wherein said thickener is present in said system at about 0.001 to about 0.5 parts by weight per part by weight of gelatin.
Claim 9
Dependent Claim
31 words
The process for hardening gelatin of claim 7, wherein said hardener is present in said system at about 0.0001 to about 0.1 parts by weight per part by weight of gelatin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |